Atek HP 8753D, Руководство пользователя, Страница: 636 / 677

analyzer from disk, the stimulus and response parameters are restored rst. If correction is on
for the loaded state , the analyzer will load a calibration set from disk that carries the same title
as the one stored for the instrument state .
Conserving Memory
If you are concerned about conserving memory , either internal memory or external disk space ,
some of the most memory-intensive operations include:
two-port error correction
interpolated error correction
1601 measurement points
using time domain
saving data arrays and graphics with the instrument state
Using Saved Calibration Sets
When you are saving to internal memory (CMOS, non-volatile memory), calibration sets are
linked to the instrument state and measurement parameter for which the calibration was
done . Therefore a saved calibration can be used for multiple instrument states as long as the
measurement parameter , frequency range , and number of points are the same . A full 2-port
calibration is valid for any S-parameter measurement with the same frequency range and
number of points . When an instrument state is deleted from memory , the associated calibration
set is also deleted if it is unused by any other state .
The following hints will help you avoid potential problems:
If a measurement is saved with calibration and interpolated calibration on, it will be restored
with interpolated calibration on.
A calibration stored from one instrument and recalled by a dierent one will be invalid. T o
ensure maximum accuracy , always recalibrate in these circumstances .
No record is kept in memory of the temperature when a calibration set was stored.
Instrument characteristics change as a function of temperature , and a calibration stored at
one temperature may be inaccurate if recalled and used at a dierent temperature . See
Chapter 7, \Specications and Measurement Uncertainties ," for allowable temperature ranges
for individual specications .
The HP 8753D can read disk les created by the HP 8753B/C and the HP 8753B/C can read
les created by the HP 8753D . A disk le translator is available to make HP 8753A disk les
compatible with HP 8753B les . These les can then be read by the HP 8753D . Contact your
local Hewlett-P ackard sales and service oce for a copy of this disk le translator .
Preset State and Memory Allocation 12-5